Effective zero-thickness model for a conductive membrane driven by an electric field

The behavior of a conductive membrane in a static (dc) electric field is investigated theoretically. An effective zero-thickness model is constructed based on a Robin-type boundary condition for the electric potential at the membrane, originally developed for electrochemical systems. Within such a f...

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Main Authors: Ziebert, Falko (Author) , Bazant, Martin Z. (Author) , Lacoste, David (Author)
Format: Article (Journal)
Language:English
Published: 11 March 2010
In: Physical review. E, Statistical, nonlinear, and soft matter physics
Year: 2010, Volume: 81, Issue: 3, Pages: 1-13
ISSN:1550-2376
DOI:10.1103/PhysRevE.81.031912
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevE.81.031912
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevE.81.031912
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Author Notes:Falko Ziebert, Martin Z. Bazant, and David Lacoste

MARC

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520 |a The behavior of a conductive membrane in a static (dc) electric field is investigated theoretically. An effective zero-thickness model is constructed based on a Robin-type boundary condition for the electric potential at the membrane, originally developed for electrochemical systems. Within such a framework, corrections to the elastic moduli of the membrane are obtained, which arise from charge accumulation in the Debye layers due to capacitive effects and electric currents through the membrane and can lead to an undulation instability of the membrane. The fluid flow surrounding the membrane is also calculated, which clarifies issues regarding these flows sharing many similarities with flows produced by induced charge electro-osmosis (ICEO). Nonequilibrium steady states of the membrane and of the fluid can be effectively described by this method. It is both simpler, due to the zero thickness approximation which is widely used in the literature on fluid membranes, and more general than previous approaches. The predictions of this model are compared to recent experiments on supported membranes in an electric field. 
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